What are stacked stitches? Stacks are a bunch of stitches piled on top of each other. They can be used to create vertical movement within a row. Stacks are great for creating colorwork which is free of strands on the wrong side. In this class, students will learn the basics of knitting with stacked stitches. You will cast on a swatch or scarf, use markers to keep track of stitch count and learn how to fix mistakes.